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1. #Wild t2 theodolite serial numbers serial numbers#
2. #Wild t2 theodolite serial numbers full#
3. #Wild t2 theodolite serial numbers registration#

#Wild t2 theodolite serial numbers registration#

Upon arrival the instrument was not even correctly assembled, by which the yoke had about a millimetre play with the base. Judging a minute speck in the objective glass and some scratches on the joke it has had a rough life in the field.

#Wild t2 theodolite serial numbers full#

The one showed here is sexagesimal divided (so in degrees, minutes and seconds), while the geodetic Wild T3 in my collection is centesimal divided (400 divisions in a full circle).Īnother major difference with the geodetic T3 is the reticle.Īnother difference is the electricity connector which differs from the usual shape known from Wild instruments.Īs the connector has the same paint as the rest of the instrument it may have been changed on request by the owner. The three oculars allow to use the instrument with varying magnifications of 24x, 30x and 40x (see figure 7 ). In contrast the Wild T2 was one of the most popular instruments among land surveyors here in the Netherlands in that period and were used probably in their hundreds.

#Wild t2 theodolite serial numbers serial numbers#

Wild Theodolite S Serial Numbers 18815 AndĪt least another two were owned by GrontMij and sold when they became redundant (one of which with serial no 82980 is in the collection of a colleague) and at least three (but possibly four or even five) were used by the Dutch triangulation division Rijksdriehoeksmeting of the topographical department Kadaster (two instruments with serial numbers 1884 still remain in the collection of the Kadaster Bedrijfsmuseum, for the 74314 see picture 23 on their web site). The 26595 is a T3R (Recording) on which it was possible to mount a camera on the tube to photograph the circles, allowing interpretation afterwards using a microscope. Soon after other institutes and companies in the Netherlands started using T3s as well, but so far I have traced only seven of them at least two were used at the University of Delft (serial nos 2652 ) and still remain in their collection. In order to speed up the calculations - which at the time were done using calculators of Brunsviga and Marchant, like the Brunsviga Models D13 R2 and 13ZK and the Marchant Pin Wheel 10 - the instruments were sent back to Swiss to have them modified to the centesimal system. The T3 was only used in small quantities here in the Netherlands. Later models would still be divided in the same way, but were numbered 0-00 to 2-00 making the multiplication unnecessary.Įven though the instrument has not been maintained for a long period of time and being shipped from Switzerland it still showed a horizontal index error of only 4 and a vertical index error of just under 2 when I first tested it. When reading the micrometer scale the figure found has thus to be multiplied by 2 in order to get the actual arc minutes and seconds (see figure 13 ). The mayor intervals are subdivided into 10 parts each, making each division 0.2. Reading the circles is something to get used to as the micrometer scale of this early model is divided in 60 mayor intervals spanning 2 in total, while being numbered 0-60 (see figure 13 ). The accuracy of the direction reading is given as 0.5. Like this one the majority of the T3s had sexagesimal circles (divided in degrees) and can be read down to 0.2 and estimated to 0.1 or better (see figure 13 ).Ĭentesimal T3 have been made as well, especially for the Dutch government (see below). The T3 does not have a compensator for the vertical index, a large coincidence level (see figure 10 ) with a settling accuracy of 0.5 is used instead.

Wild Theodolite S Serial Numbers 18815 And.