Other Archives - Page 2 of 18

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Interesting Terrestrial Floor Library Globe by Felk Pragua C 1860 Brass méridien circle . Equatorial circle with months days and zodiacal signs Foot in blacked wood with Brass compass Read More...

26 Jan

Regnier Dynamometer by Amadori in Bologna

By Van Leest Antiques

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This mid 19th century dynamometer was made by ‘Amadori of Bologna’ used to measure the human muscle force and was invented by the French Civil Engineer Edme Regnier (1751-1823). The device was popularised by Professor Edmond Desbonnet, who used to test the strongmen and professional wrestlers of their day to compare compare their results. The device facilitated the measurement of two distinct forces: Pressure force, accomplished by gripping and squeezing the double steel bow, and Traction force, achieved by pulling Read More...

26 Jan

P.M. Tamson Dasymeter

By Van Leest Antiques

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A P.M. Tamson Dasymeter or baroscop to measure the Buoyancy of Air or the weight of air. A small balance supporting a glass bulb and a small weight on two sides of an arm. When placed in a evacuated bell jar the glass bulb appears heavier due to its greater loss of buoyancy. The balance arises from a black painted steel stand a painted label says it was made by ‘P.M. Tamson instrumenten Den Haag’. This instrument maker was founded Read More...

24 Jan

Italian horn 18th century single microscope in fitted horn etui

By Gilgamesh

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Focusing is by turning the threaded lens holder. Condition is as seen, some past damage to the horn box in the thread and the base edges by pests (not present now). Read More...

24 Jan

Early 18th century ebony and bone Spike-Stand “flea glass” simple microscope

By Gilgamesh

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These are early Dutch forms of the spike-stand microscope lathe-turned of bone, horn, and wood. This early and relatively rare form of the Spike-Stand microscope is more or less similar to Zahn’s depiction; the latter was probably turned of wood. Read More...

22 Jan

The Arlo Patent Circular Slide Rule

By Fletcher

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The “Arlo” patent slide rule, The Hague, Holland-in good condition in original aluminium case,celluloid cursor. Read More...

19 Jan

C1790 ITALIAN, MINIATURE GLASS SPYGLASS GOLD MOUNTS, GOOD COND. LENS GOOD

By Opticalworld

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GOOD FUNCTIONING SPYGLASS WITH ITS LEATHER CASE. CLOSES WITH HEALTHY CLICK , CASE NOT QUITE FLUSH WHEN CLOSED ,NOTHING BROKEN , LENS SPYGLASS EXCELLENT Read More...

09 Jan

A 19th century travel compass with inclinometer, beautifully signed

By Early Science

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For sale is a 19th century travel compass with inclinometer, beautifully signed from a high-quality maker, I cannot recognize the beautifully engraved name, if anyone knows who it is, please let me know.The compass dial features a copper cover to ensure its protection, revealing an astonishingly good compass dial with scale. The very outer ring is meticulously engraved, the lower dial contains an inclinometer that can rotate freely under the compass needle. The original accessories are still in the boxThe Read More...

24 Dec

Collection of 10 Geometric Forms or models in Zinc ca 1930

By Early Science

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Collection of 10 Geometric Forms or models in Zinc ca 1930 in good condition with beautiful gray patina, dimensions varying from 14 to 8 cm high.One of the models has a maker’s mark that is not clearly legible, see the detail photowill be well packaged and shipped by registered mail.Price €350.- including shipping costs Read More...

23 Dec

Eye and Instruments, nineteenth-century ophthalmological instruments in the Netherlands and Europe

By ARCHIPEL International Maritime Gallery

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This book is essentially a catalog of eye instruments from the 19th century, previously owned by the Dutch Hospital for Eye Patients in Utrecht. The hospital was founded in 1858 by FC Donders (1818-1889). Donders was director until Herman Snellen (1834-1908) succeeded him in 1862, after having been director of the hospital for many years. These were the instruments that Donders and Snellen had designed, adapted or purchased. Many of them are prototypes of instruments that have become famous Read More...

10 Dec

Early 18th century Brass ‘Zeemeter’ – Pieter Holm, Amsterdam

By ARCHIPEL International Maritime Gallery

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Dutch seaman’s tobacco box of Pieter Holm, also known as the Dutchman’s Log, with a perpetual calendar on the top of the lid and a ship’s speed table on the bottom. In a publication of 1748 Holm claims to have devised this table in 1729. The top of the lid is further adorned with simple vignettes portraying Julius Caesar and Pope Gregory XIII, who respectively in 45 BC and AD 1582 introduced the Julian calendar and the Gregorian calendar. The bottom carries Read More...

09 Dec

Hand log with reel, chip, peg and hour glass – ca. 1850

By ARCHIPEL International Maritime Gallery

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The hand log was first described in 1574 (Sharp, p 5). It consists of a wooden chip with peg, the log line, a reel and a 28 (long) or 14 second (short) sand glass. The chip in the shape of a circle sector and weighted with lead, is fitted with two lines to the peg, the end of the log line forms the third. After a stray line of about thirty meters, the log line is equally divided into Read More...