Hi: All US patents are on line. Sources for free on line TIF viewers can be found under help\How to Access Patent Full-page Images. Older patents can only be accessed by traditinal US class number or patent number, none of the other search methods will work. US 946,223 can be seen at: <http://164.195.100.11/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=/netahtml/srchnum.htm&r=1&f=G&l=50&s1='946,223'.WKU.&OS=PN/946,223&RS=PN/946,223>
Have Fun, Brooke Clarke PS the "<... >" should keep the link from breaking fwsawyer wrote: > The Homan sundial was also patented in the U.S.: Patent # 946,223 issued on > 11 Jan. 1910. I have a copy of the patent papers in a 320Kb pdf file which > I will send to anyone who requests it (off-list please). > > Fred Sawyer > > ----- Original Message ----- > From: "Andrew James" <[EMAIL PROTECTED]> > To: <[email protected]> > Sent: Wednesday, July 31, 2002 7:33 AM > Subject: Heliochronometer by Homan > > > I have recently been shown an interesting brass heliochronometer made by > W. > > Homan of Glasgow according to his patent 18,568 of 1911. (I hope to > receive > > a copy of the patent shortly.) > > > > It is quite large, based on a 13 1/2" diameter hemisphere. It has two > > "gnomons", upright brackets carried on and perpendicular to a circular > plate > > 11" diameter. The plate has, over an adjustable 15 degree arc at its edge, > a > > scale divided in minutes, and can be rotated by hand against an outer > fixed > > ring marked with hours from 1 to 12 twice. Each upright carries a half > > analemma, one for positive and the other for negative solar declination > > (summer and winter), and a slit - with in one case a small hole adding a > > nodus to the slit - to project light onto the half analemma on the other > > upright 7 7/8" (200 mm) away. > > > > It is set for a latitude (not adjustable) of about 7 degrees North, and a > > time difference from the local meridian of 5 minutes (added to the > reading, > > so it was sited just over 1 degree West). This indicates it was made for > use > > not in Britain but somewhere tropical, perhaps West Africa or Ceylon. > > > > Has anyone come across other example(s), or information about this device > or > > its maker? > > > > Andrew James > > N 51 04' W 01 18' > > - > > > > - -
