Show THE HOME RADIO how to make and use I 1 it ftp by A HYATT VERRILL C bit bf H w ft aab 1 I g JV IV RECEIVING SETS 0 broadly speaking I 1 the receiving set consists of th the e antenna or aerial the tl vr tho detector and the receiver irit but aside from the aerial each part of t Is 19 made up lip of several ither units and appliances each devised and used for a definite purpose the aerial witch Is a wire designed to interrupt or catch a portion of the continuous waves wakes always rei referred erred to in wireless telephone parlance parlan cefis as C IV consists of a single wire for un like wireless telegraphy a number of atz strand or wires Is of no advantage in III re and still more remarkable it I 1 makes no difference whether the wire be hure bare or insulated for the C IV use used d in radio telephony penetrates solids of every kind indeed a vo ire stretched around a room or through a hallway indoors or etoen ec a metal bedstead or bed spring may seno as an aerial for receiving Nir wireless eless 7 ry 7 telephone mesa although far better results are secured by properly dinst installed ailed aerials out of doors and here it may be wise ise to impress all users of receiving sets with the fact that the longer the aerial a and the higher above tile the ground the better will ho be the results obtained obal tined although an aerial feet long and viell veil above other large buildings will serve every purpose Hoi cover it maltes makes no difference whether the aerial Is horizontal zoll tal vertical or at an angle provided it Is thoroughly v insulated from all sur soundings loun dings and very nery good god results have been obtained by aerials run roll verti vertically call up an air shaft or along the side of a building so too tho lead lu JU I 1 or wire connecting the aerial with the receiving instrument serves as an neigal itself end and therefore a long leadin lead leall in with a short aerial will serve almost as well vell as n long aerial and short leadin lead in which Is a tremendous advantage to dwellers in hotels apartment houses etc where it Is very or impossible to install it d long and lofty aerial on the roof hut but before going into details and deser I 1 b ing the installation of aerials let us consider the rest of the receiving equip i ment and thoroughly understand its principles the detector without which it would too bu impossible to register or detect the minute cu currents rients of waves which pass through the aerial Is a very important part of the mechanism there are two types of de detectors in use ue til alie e ii fir r I 1 known knon n as the crystal detector and the other oilier us as the vacuum tube in the tor for 1 inert iner a crystal of some mineral preferably galena Is used while in the hit ter a form of incandescent lamp especially prepared it filament Is employed of the two the former is 18 the cheaper and Is used on most of th heap ivady f made sets but it has limitations and is not nearly as satisfactory ly in many ways as the vacuum tube as will be laler inter the third unit or tuner tun L r Is I 1 S the I 1 means by which the entire apparatus Is made to pick up the sounds from some station or elsewhere and by means of which other oilier sounds are arc shut out for only by means of tile tuner can call the receiving set be placed lii in synchronism or tune with the waves caroling the sounds you wish to hear tile lat idt unit or receiver Is I 1 merely it tele pheine receiver made for lite I 1 lie ise and NO which aich on oil a small set get Is worn over the ears exactly as ag in re receiving elving wireless 14 telegraph inc sages anges figure 7 illustrates in diagrammatic form these units with their relative i positions in like set but there are beveral good which ale essential to ito good bood results |